remove c0re.operatorPronouns and c0re.contextWindowTokens

Both options are now ignored with a warning (the swarm-peers-removed.nix
shape), so a host that still sets one keeps evaluating.

- operatorPronouns: the agents' system prompt names the pronouns as
  she/her, the value the harness fell back to and the option's default.
  The --operator-pronouns flag, HiveEnv field, meta-flake let binding
  and HIVE_OPERATOR_PRONOUNS env var are gone.
- contextWindowTokens: the per-family defaults (haiku 200000, sonnet
  1000000, opus 1000000) move into hive-agent's harness_state as a
  table; the window the API reports after a turn still wins. The
  --context-window-tokens flag, HiveEnv field and the rendered
  HIVE_CONTEXT_WINDOW_TOKENS_<KEY> env vars are gone.

hive-agent/src/harness_state.rs

@@ -237,33 +237,31 @@ pub fn configured_effort() -> Option<&'static str> {
         .map(|s| &*Box::leak(s.into_boxed_str()))
 }
 
-/// Context-window size in tokens for a given model name.
-///
-/// Canonical per-model sizes are declared in the harness nix modules as
-/// `hyperhive.contextWindowTokens` and injected as
-/// `HIVE_CONTEXT_WINDOW_TOKENS_<KEY_UPPER>` env vars — so this function
-/// normally just reads them. The Rust code carries no model knowledge;
-/// updating model families only requires a Nix change.
+/// Context-window size in tokens per model family, keyed by a substring
+/// of the model name (`"sonnet"` matches `"claude-sonnet-4-5"`).
+const CONTEXT_WINDOW_DEFAULTS: [(&str, u64); 3] = [
+    ("haiku", 200_000),
+    ("sonnet", 1_000_000),
+    ("opus", 1_000_000),
+];
+
+/// Context-window size in tokens for a given model name, used until a
+/// completed turn reports the real window (`Bus::effective_context_window`
+/// prefers that one).
 ///
 /// Resolution order (first match wins):
-/// 1. `HIVE_CONTEXT_WINDOW_TOKENS_<KEY>` — key (lowercased) is a
-///    substring of the active model name. Populated by the Nix default
-///    map for all known families; add/override in `agent.nix`.
+/// 1. [`CONTEXT_WINDOW_DEFAULTS`] — the family key, case-insensitively,
+///    is a substring of the model name.
 /// 2. `HIVE_CONTEXT_WINDOW_TOKENS` — single global override (any model).
-/// 3. Hard fallback: `200_000` (conservative; only hit outside NixOS).
+/// 3. Hard fallback: `200_000`.
 #[must_use]
 pub fn context_window_tokens(model: &str) -> u64 {
     let m = model.to_ascii_lowercase();
-    // Per-model env vars set by `hyperhive.contextWindowTokens` in Nix.
-    for (key, val) in std::env::vars() {
-        if let Some(suffix) = key.strip_prefix("HIVE_CONTEXT_WINDOW_TOKENS_")
-            && !suffix.is_empty()
-            && m.contains(&suffix.to_ascii_lowercase())
-            && let Ok(v) = val.trim().parse::<u64>()
-            && v > 0
-        {
-            return v;
-        }
+    if let Some((_, tokens)) = CONTEXT_WINDOW_DEFAULTS
+        .iter()
+        .find(|(family, _)| m.contains(family))
+    {
+        return *tokens;
     }
     // Global override (single value, any model).
     if let Ok(s) = std::env::var("HIVE_CONTEXT_WINDOW_TOKENS")
@@ -272,13 +270,25 @@ pub fn context_window_tokens(model: &str) -> u64 {
     {
         return v;
     }
-    // Hard fallback for dev/test outside NixOS where env vars aren't set.
     200_000
 }
 
 #[cfg(test)]
 mod tests {
-    use super::{DEFAULT_EFFORT, DEFAULT_MODEL, Source, effort_from, model_from};
+    use super::{
+        DEFAULT_EFFORT, DEFAULT_MODEL, Source, context_window_tokens, effort_from, model_from,
+    };
+
+    #[test]
+    fn context_window_defaults_per_model_family() {
+        assert_eq!(context_window_tokens("claude-haiku-4-5"), 200_000);
+        assert_eq!(context_window_tokens("haiku"), 200_000);
+        assert_eq!(context_window_tokens("claude-sonnet-4-5"), 1_000_000);
+        assert_eq!(context_window_tokens("Claude-Sonnet-4-6"), 1_000_000);
+        assert_eq!(context_window_tokens("sonnet"), 1_000_000);
+        assert_eq!(context_window_tokens("claude-opus-4-1"), 1_000_000);
+        assert_eq!(context_window_tokens("opus"), 1_000_000);
+    }
 
     #[test]
     fn compiled_default_effort_matches_claude_settings() {